Mr. Potter is an Incorporated Engineer (IEng designation)
registered with the Engineering Council in the United Kingdom

The engineering profession in the United Kingdom is regulated by the Engineering Council, under its Royal Charter, through 36 engineering Institutions (Licensed Members) who are licensed to put suitably qualified members on the ECUK's Register of Engineers.

The Incorporated Engineer title is one of three titles protected by the Engineering Council's Royal Charter and may only be used by registrants.